Mixer for metal superheating

ABSTRACT

A mixer comprises a rotary casing arranged horizontally as a truncated cone and lined with a refractory material. Provided inside the casing along its generant are radial lugs of a rectangular section. The height of said lugs is some 0.1 to 0.3 of an average diameter of the inner lining of the casing. The lugs form, together with the inner surface of the casing lining, channels combined into a common ring channel provided in the lining on its portion adjoining the greater base of the casing.

United States Patent Cherny et al.

1111 3,897,049 July 29, 1975 1 MIXER FOR METAL SUPERHEATING Inventors: Anatoly Alexeevich Cherny, ulitsa Slavy, 7, kv. 40; Vladimir Alexandrovich Grachev, ulitsa Odesskaya 6, kv. 54; Evgeny Mikhailovich Kirin, ulitsa Suvorova, 166, kv. 9; Nikolai Andreevich Gorelov, Ulyanovskaya 8, kv. 65, all of Penza; Nikolai Vasilievich Boriskin, ulitsa Gorodok 114, Penzenskaya oblast, Bessonovka, all of USSR.

Filed: Mar. 21, 1974 Appl. No.: 453,371

Foreign Application Priority Data Mar. 27, 1973 U.S.S.R 1899192 US. Cl 266/39; 266/18 Int. Cl. F27b 7/16 Field of Search 432/118; 266/18, 33 R,

[56] References Cited I UNITED STATES PATENTS 728,109 5/1903 James 266/34 R 1,836,139 12/1931 Trumble 3,385,585 5/1968 Kawawa 266/34 R X Primary Examiner-Gerald A. Dost Attorney, Agent, or Firm-Waters, Schwartz & Nissen [57] ABSTRACT A mixer comprises a rotary casing arranged horizontally as a truncated cone and lined with a refractory material. Provided inside the casing along its generant are radial lugs of a rectangular section. The height of said lugs is some 0.1 to 0.3 of an average diameter of the inner lining of the casing. The lugs form, together with the inner surface of the casing lining, channels combined into a common ring channel provided in the lining on its portion adjoining the greater base of the casing.

1 Claim, 3 Drawing Figures VZ/V/ MIXER FOR METAL SUPERI-IEATING The invention relates to devices for melting and superheating metals, used in ferrous metallurgy and more particularly to mixers for metal superheating.

Known in the art is a mixer for metal superheating in the form of a rotary casing arranged horizontally as a truncated cone, wherein provided from the side of a larger base are a gas burner and a discharge spout for metal discharge and from the side of a smaller base are an exhaust pipe for removing combustion production from the mixer and a feeding chute through which molten metal is fed thereinto. However, in said mixer, it is impossible to attain a high superheating temperature and obtain a chemically homogenous metal due to the absence of intensive mixing of molten metal therein.

An object of the present invention is to provide a mixer for metal superheating, whose design would help step up the molten metal superheating process.

Another object of the invention is to reduce the specific gas consumption.

Yet another object of the invention is to increase the thermal efficiency of the mixer.

This object is accomplished by providing a mixer for metal superheating, comprising a rotary casing arranged horizontally as a truncated cone and lined with a refractory material, wherein provided from the side of a larger base are a gas burner and a discharge spout for metal discharge and from the side of a smaller base are an exhaust pipe for removing combustion products from the mixer and a feeding chute through which molten metal is fed thereinto, and wherein, according to the invention, there are rectangular lugs arranged radially inside the casing along its generant to be as high as some 0.1 to 0.3 of the value of an average diameter of the inner lining of said casing and forming, together with the inner surface of said lining, channels 16 and 17 combined into a common ring channel provided in the lining on its portion adjoining the larger base of said casing.

The provision of the lugs on the inner surface of the lining will permit to expand the superheating area and step up the related process.

Follows an exemplary embodiment of the mixer for metal superheating, wherein:

FIG. 1 shows the mixer of the invention, lateral view;

FIG. 2 is ditto, longitudinal section; and

FIG. 3 is a section IIIIII as in FIG. 2.

The mixer has a casing 1 (FIGS. 1 and 2) in the form of a truncated cone.

The inner surface of the casing 1 has a refractory lining 2.

Provided on an external lateral surface of said casing 1 at equal spacing from bases are two ring guides 3 by which the mixer rests on four rollers 4 mounted on a foundation 5. Via a sleeve 6 and a reducer 7, one of the rollers is linked with an electric motor 8 for rotating the mixer. From the side of a larger base of said mixer, there is a gas burner 9 to which gas is supplied through a gas line 10 and air through an air duct 11. For discharging molten metal from the mixer, there is a discharge hole 12 and a discharge spout 13.

From the side of a smaller base of the mixer, there is an exhaust pipe 14 for removing combustion products from it and a feeding chute 15 designed to help feed molten metal and master alloys into said mixer.

Provided readially on the inner surface of the refractory lining 2 are rectangular lugs 16 (FIG. 3) as high as 0.1 to 0.3 of the average diameter of the inner lining. These lugs 16 form, together with the inner surface of said lining 2, channels 17 combined into a common ring channel 18 (FIG. 2) provided in the lining on its portion adjoining the larger base of the casing l.

The mixer operates in the following manner.

Prior to its operation, the gas burner 9 (FIGS. I and 2) is fired and the mixer is being heated for 40 min up to some 1,600C. Then, molten metal is fed into the mixer along the feeding chute l5 and the drive of the electric motor 8 is cut in. The provision of the radial lugs 16 (FIG. 3) on the inner surface of the lining, together with the channels 17, helps expand the superheating area and step up the related process, as the rotation of the mixer permits to trap molten metal which flows then through the channels 17 and over into the metal bath as drops and small streams.

During their fall, drops and small streams of the molten metal are exposed to hot gases and superheated intensely. Metal superheating continues for 30 to 35 min. Then the mixer drive is disengaged and hot metal is drained through the hole 12 and spout 13.

The provision of the ring channel 18 permits to discharge hot metal from the mixer completely. The mixer can operate both on cold and hot air.

The mixer of the invention is simple in design and permits to superheat molten metal up to 1,520C. The provision of the radial lugs and channels on the inner surface of the mixer lining permits intensive mixing of the hot metal, which is also conductive to the absorption by it of alloying additives at a high temperature of the metal.

What we claim is:

1. A mixer for metal superheating, which comprises; a casing in the form of a truncated cone, arranged horizontally with the capability of rotation around its axis; a refractory lining arranged inside said casing; a gas burner mounted on said casing on the side of the larger base of said truncated cone; a discharge spout for discharging metal, mounted on said casing on the side of the larger base; an exhaust pipe for evacuating combustion products, mounted on said casing from the side of the smaller base of said truncated cone; a feeding chute for feeding molten metal, mounted on said casing on the side of the smaller base; radially inwardly extending spaced lugs of a rectangular section, axially extending within said casing along its circumference and adjoining said lining, said lugs having a height of about 0.1 to 0.3 of the average diameter of said lining; channels formed by the spaces between said lugs and the inner surface of said lining; and a ring channel provided in said casing lining on its portion adjoining the larger base of the casing and combining said channels. 

1. A mixer for metal superheating, which comprises; a casing in the form of a truncated cone, arranged horizontally with the capability of rotation around its axis; a refractory lining arranged inside said casing; a gas burner mounted on said casing on the side of the larger base of said truncated cone; a discharge spout for discharging metal, mounted on said casing on the side of the larger base; an exhaust pipe for evacuating combustion products, mounted on said casing from the side of the smaller base of said truncated cone; a feeding chute for feeding molten metal, mounted on said casing on the side of the smaller base; radially inwardly extending spaced lugs of a rectangular section, axially extending within said casing along its circumference and adjoining said lining, said lugs having a height of about 0.1 to 0.3 of the average diameter of said lining; channels formed by the spaces between said lugs and the inner surface of said lining; and a ring channel provided in said casing lining on its portion adjoining the larger base of the casing and combining said channels. 